Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#include "comm.h"
2#include "util.h"
3#include <stdlib.h>
4#include <stdio.h>
5
6struct comm_str {
7 char *str;
8 struct rb_node rb_node;
9 int ref;
10};
11
12/* Should perhaps be moved to struct machine */
13static struct rb_root comm_str_root;
14
15static void comm_str__get(struct comm_str *cs)
16{
17 cs->ref++;
18}
19
20static void comm_str__put(struct comm_str *cs)
21{
22 if (!--cs->ref) {
23 rb_erase(&cs->rb_node, &comm_str_root);
24 free(cs->str);
25 free(cs);
26 }
27}
28
29static struct comm_str *comm_str__alloc(const char *str)
30{
31 struct comm_str *cs;
32
33 cs = zalloc(sizeof(*cs));
34 if (!cs)
35 return NULL;
36
37 cs->str = strdup(str);
38 if (!cs->str) {
39 free(cs);
40 return NULL;
41 }
42
43 return cs;
44}
45
46static struct comm_str *comm_str__findnew(const char *str, struct rb_root *root)
47{
48 struct rb_node **p = &root->rb_node;
49 struct rb_node *parent = NULL;
50 struct comm_str *iter, *new;
51 int cmp;
52
53 while (*p != NULL) {
54 parent = *p;
55 iter = rb_entry(parent, struct comm_str, rb_node);
56
57 cmp = strcmp(str, iter->str);
58 if (!cmp)
59 return iter;
60
61 if (cmp < 0)
62 p = &(*p)->rb_left;
63 else
64 p = &(*p)->rb_right;
65 }
66
67 new = comm_str__alloc(str);
68 if (!new)
69 return NULL;
70
71 rb_link_node(&new->rb_node, parent, p);
72 rb_insert_color(&new->rb_node, root);
73
74 return new;
75}
76
77struct comm *comm__new(const char *str, u64 timestamp)
78{
79 struct comm *comm = zalloc(sizeof(*comm));
80
81 if (!comm)
82 return NULL;
83
84 comm->start = timestamp;
85
86 comm->comm_str = comm_str__findnew(str, &comm_str_root);
87 if (!comm->comm_str) {
88 free(comm);
89 return NULL;
90 }
91
92 comm_str__get(comm->comm_str);
93
94 return comm;
95}
96
97void comm__override(struct comm *comm, const char *str, u64 timestamp)
98{
99 struct comm_str *old = comm->comm_str;
100
101 comm->comm_str = comm_str__findnew(str, &comm_str_root);
102 if (!comm->comm_str) {
103 comm->comm_str = old;
104 return;
105 }
106
107 comm->start = timestamp;
108 comm_str__get(comm->comm_str);
109 comm_str__put(old);
110}
111
112void comm__free(struct comm *comm)
113{
114 comm_str__put(comm->comm_str);
115 free(comm);
116}
117
118const char *comm__str(const struct comm *comm)
119{
120 return comm->comm_str->str;
121}